After seeing 4 different colonies of pulsing xenia...well..not pulse, I decided to pick up a Salifert Iodine test. This thing was a bit more involved then I was hoping for, but the initial results are: Iodide: 0.01 Iodate: 0 (no color change) Iodiate/Iodine: 0 (no color change) I've been using 3 to 4 drops of Lugol's weekly, and it seems this isn't enough. What do you other reefers use as a supplement? I suppose I could just increase the amount/frequency of Lugol's dosage, but the label doesn't mention how much product will increase the numbers by x amount (if that makes any sense). Other parameters are: Alk:3.2 meq/l Ph: 8.2 Ca: 410 Mg: 1180 temp: 78-80.5 No3: ~10 Any help would be appreciated. I've never been able to get this stuff to pulse no matter what amount of flow or light they are subjected to.